Water-tube steam-generator.



No. 684,43L Patented Oct. l5, [90L J. M. HURD.

WATER TUBE STEAMVGENERAT'OR.

Application filed July 18, 1901.)

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No. 684,431. Patented 00f. l5, 190i. J. M. HURD.

WATER TUBE STEAM GENERATOR.

(Application filed July 18, 1901.) (No Model.) 5 Sheets-Sheet 2.

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No. 684,431. Patented Oct. l5, l90l. J. M. HURD.

WATER TUBE STEAM GENERATOR.

(Applicntion filed July 18, 1901.)

5 Sheets-Sheet 3.

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WATER TUBE STEAM GENERATOR.

(Application filed. July 18, 1901.) (No Model.) 5 Sheets-Sheet 5.

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UNITED STATES PATENT OFFICE.

JAMES MILNER HURD, OF STOKE-UPON-TRENT, ENGLAND.

WATER-TUBE STEAM-GENERATOR.

STEECIFICATIGN forming part of Letters Patent No. 684,431, dated October15, 1 901.

Original application filed May 4, 1901, Serial No. 58,749. Divided andthis application filed July 18, 1901. Serial No.

68,830. (No model.)

To all whom, it nuby concern.-

Be it known that I, JAMES MILNER HURD, civil engineer, a subject of theKing of Great Britain, residing at 6 Church View Villas, \Volstanton,Stoke-upon-Trent, in the county of Staiford, England, have inventedcertain new and useful Improvements in Water-Tube Steam-Generators, ofwhich the following is a specification.

My improvements relate to the class of steamgenerators commonly known aswatertube boilers. I so construct boilers of this kind that if a tube orone or more of a group of tubes is damaged or ruptured while work- .ingsuch tube or group of tubes is at once shut off or isolated from therest of the boiler by self-acting valves, so that the boiler can stillbe workedunder full steam-pressure until such time as it is convenientto repair or replace the damaged tube or group of tubes. I also providefor moving any of these valves onto or ofi their seats by hand gearworked from the exterior of the casing with which the boiler isinclosed, so that it can always be insured that the valves shall be inproper working order. This I effect by carrying each self-closing valveon one end of a spindle which at its other end passes out from theheader through a stufling-box, so that by acting upon this end of thespindle it maybe moved to or fro endwise. The valve fits loosely on itsspindle, so that it may be selfclosing, but can be held up to its seator moved away from it by collars on the spindle when the spindle ismoved endwise in one or other direction.

My improvements are shown in the drawings annexed as applied to awatertube boiler constructed as described in another application forpatent lodged by me.

Figure 1 is a front View of the boiler with the front cover removed fromthe left-hand half, and Fig. 2 is a transverse section of the same.Figs. 3 and 4 show the valve mechanism. Fig. 3 is a longitudinalsection, on a a transverse section showing my valve mechanism applied toa modified form of the boiler.

In Figs. 1 and 2, a is the steam-cylinder which forms the top of theboiler.

17 and c are the upper headers. At the top they are, as shown, bent overinto a horizoir tal position and connected to the two opposite sides ofthe cylinder a above the waterlevel.

b and c are the lower headers, and d represents the straight tubesconnecting the upper and lower headers.

e is the back horizontal water-cylinder, to which the lower ends of thelower headers c are connected, and f is the front horizontalwater-cylinder, to which the lower ends of the lower headers b areconnected.

9 represents the fire-door openings.

h represents the furnace-bars.

2' is an outer casing inclosing the heated por tions of the boiler. Thecasing is in sections, each provided with handles i, by which it canreadily be lifted away.

j is a water-gage.

7c is a self-closing valve at the lower end of each lower header, whereit opens into one of the lower water-cylinders, and Z a self-closingvalve at the upper end of each upper header, where it enters thesteam-cylinder. In Figs. 3'and 4 I have shown how I provide not only forallowing these valves to close freely should there be any sudden rush offluid past them, but also for enabling them to be closed or held open,as may be desired, by hand-gear. The ends of the header shown in thesefigures are the ends of one of the lower headers 1). Its valve 7t canslide freely to and fro for a distance along the end of a rod at betweena collar 12 upon it and another collar 0 at its end. Normally the valveremains open, as shown in Fig. et. Should, however, there be a suddenleakage of steam from one of the pipes connected with this header thesudden rush of water from the cylinder f past the valve and into theheader which would thereby be caused would instantly move the valvealong the rod m and cause it to close against its seat 19, which isfixed in the end of the header. This header and all tubes opening intoit would thus be at once put out of action. Similarly the correspondingupper header b would be simultaneously put out of action by the closingof the valve Zby the rush of steam past it. Thus this section would beentirely out 01f from the rest of the boiler, so that the boiler couldstill-be worked under full steam-pressure until such time as might beconvenient to repair or replace the damaged section. As will be seenfrom Fig. 3, the opposite end of the rod m to that on which the valve kis mounted extends through a stuffing-box b on the upper end of theheader. It also has a screw-thread cut upon it which screws through ascrew-nut q, fixed to this end of the header. m in one or otherdirection either the collar 71 or the collar on the rod can be broughtagainst the valve, and thus either hold it openor closed, as may bedesired. By from time to time moving the valve onto and off its seat inthis way the valve can readily be kept always in proper working order.In Figs. and 6 the parts are marked with the same letters of referenceas in Figs. 1 and 2.

This application is a division of my application for patent, Serial No.58,749, filed May 4, 1901. In the original application claims are madeto the general construction of the furnace, while the claims in thepresent case relate particularly to a special arrangement of By turningthe rod valves dilierent in details of construction from those claimedin the former application.

\Vhat I claim is- 1. The combination of a header, a valveseat at one endof the header, a rod extending through it and through the header,astufii I V ing-box on the header through which the other end of the rodextends, a valve opposite the valve-seat free to slide for a distancealong that end of the rod which extends through the seat, collars on therod on opposite sides 40 of the valve and means for moving the rodendwise to bring one or other of the collars against the valve and holdit onto or off its seat.

2. The combination of a header, a valveseat at one end of the header, arod extending through it, and through the header, astufiing-box on theheader through which the other end of the rod extends, a valve oppositethe valve-seat free to slide for a distance along that end of the rodwhich extends through the seat, collars on the rod on opposite sides ofthe valve and a screw-thread on the rod, screwing through a nut carriedby the header.

JAMES MILNER HURD,

Witnesses:

HENRY ROBERT KING, HENRY IIUsoN.

